Older, square-looking monitors used a 4:3 aspect ratio ... Photographers and videographers might need to change the aspect ratio of a photo through cropping. For example, the Adobe Photoshop ...

Like most online publications, I need to submit images in a 16:9 aspect ratio - the iPhone default setting is 4:3. You might not have to worry about that, but if you’re an Instagram user, you know ...

For example, the aspect ratio of an earlier standard-definition (SD) screen was 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high.